im simulating the power input section of this circuit in multisim:
http://www.maximintegrated.com/app-notes/index.mvp/id/1923
the zener im using is 1N5921BRLG. this is a 6.8v 3 watt zener. im simulating both 50vdc and 90vac to simulate a phone line. now i would expect a voltage drop of 50-6.8 and 90-6.8. but i am getting way different results. it is supposed to allow 6.8 volts to power the circuit but i am getting very different results. am i doing something wrong? here is a screen shot and the multisim file attached. thank you
http://www.maximintegrated.com/app-notes/index.mvp/id/1923
the zener im using is 1N5921BRLG. this is a 6.8v 3 watt zener. im simulating both 50vdc and 90vac to simulate a phone line. now i would expect a voltage drop of 50-6.8 and 90-6.8. but i am getting way different results. it is supposed to allow 6.8 volts to power the circuit but i am getting very different results. am i doing something wrong? here is a screen shot and the multisim file attached. thank you
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